Six Sigma
Six Sigma is a structured method for reducing errors and variation in a process, using data to find the root cause of problems rather than guessing. Teams are often trained through belt levels — Yellow, Green, Black — reflecting depth of expertise.
Six Sigma vocabulary and certifications show up constantly in operations job postings, especially in manufacturing, banking back-office, and healthcare. Even a Yellow Belt signals you can approach a messy process with structure rather than instinct.
A logistics team keeps missing its on-time delivery target by a few percentage points every quarter. Using Six Sigma's DMAIC steps, they trace the shortfall to a single loading-bay delay, fix it at the source, and track the same defect rate monthly afterward to make sure it stays fixed.